1.1.14 Ensure /var/tmp partition includes the nosuid option

Information

The nosuid mount option specifies that the filesystem cannot contain setuid files.

Rationale:

Since the /var/tmp filesystem is only intended for temporary file storage, set this option to ensure that users cannot create setuid files in /var/tmp .

Solution

For existing /var/tmp partitions, edit the /etc/fstab file and add nosuid to the fourth field (mounting options) of the /var/tmp entry. See the fstab(5) manual page for more information.
Run the following command to remount /var/tmp :

# mount -o remount,nosuid /var/tmp

See Also

https://workbench.cisecurity.org/files/3393

Item Details

Category: ACCESS CONTROL, CONFIGURATION MANAGEMENT, IDENTIFICATION AND AUTHENTICATION, MEDIA PROTECTION

References: 800-53|AC-3, 800-53|CM-1, 800-53|CM-2, 800-53|CM-6, 800-53|CM-7, 800-53|IA-5, 800-53|MP-2, CSCv7|5.1

Plugin: Unix

Control ID: fd374a658efee04460fab205e778daa802d1e03260b7b8411fd9f796883eb49d